IBM RT Series Hardware Reference Manual page 147

64 possible display colors. Display colors are changed by altering
the programming of the color palette registers in the Attribute
Controller. In alphanumeric modes, any 16 of 64 colors are
displayable. the screen resolution is 320x350 for modes 0 and 1,
and 640x350 for modes 2 and 3.
The resolution displayed on the IBM Enhanced Color Display is
selected by the switch settings on the Enhanced Graphics
Adapter.
The Enhanced Color Display is compatible with all modes listed
for the IBM Color Display. the following table describes
additional modes supported by BIOS for the IBM Enhanced
Color Display:
ALPHA BUFFER BOX MAX.
MODE
#
TYPE COLORS FORMAT START SIZE PAGES RESOLUTION
0* A/N 16/64 40x25 88000 8x14 8 320x350
1* A/N 16/64 40x25
88000
8x14 8 320x350
2*
A/N 16/64 80x25
88000
8x14 8 640x350
3*
A/N
16/64 80x25 88000 8x14 8 640x350
10*
APA
4/16 80x25
A8000
8x14 1/2
640x350
16/64
*
Note that modes 0, 1, 2, and 3, are also listed for IBM Color
Display support. BIOS provides enhanced support for these
modes when an Enhanced Color Display is attached.
The values in the "COLORS" field indicate 16 colors of a 64
color palette or 4 colors of a sixteen color palette.
In mode 10, The dual values for the "COLORS" field and the
"MAX. PAGES" field indicate the support provided when 64K
or when greater than 64K of graphics memory is installed,
respectively.
IBM Enhanced Graphics Adapter 7